Compressor for refrigerating apparatus



April 0 H. M. GOLDBERG EEAL 2,505,709 COMPRESSOR FOR REFRIGERATING APPARATUS Filed May 3, 1944 KKK/"6 3 J jj L Lf I U 1 Patented Apr. 25, 1950 COMPRESSOR FOR REFRIGERATING APPARATUS Herman M. Goldberg cago, Ill.,

and Arvld E. Karlberg, Chiassignors to Chicago Seal 00., Chicago, 11]., a corporation of Illinois Application May 3, 1944, Serial No. 533,843 3 Claims. (Cl. 230-58) This invention relates to improvements in compressor units, particularly adapted, though not necessarily limited in use, for refrigerating apparatus.

Heretofore, with apparatus of this character it has been customary to enclose the motor for operating the compressor, within the compressor casing, with the result that it has been necessary, in order to gain access to the motor, to dismantle a considerable part of the compressor casing.

It is one of the objects of the present invention to overcome these difliculties and objections, and to provide an improved unit of this character, in which the motor is disposed outside of the compressor casing, and in position where access may be readily had thereto, without disturbing or opening the compressor casing.

A further object is to provide an improved com pressor unit of this character, in which the motor is mounted upon the main compressor shaft, the fan being also mounted upon the same shaft, thereby dispensing with a separate motor for operat ng the fan.

A still further object is to provide, in a compressor unit of this character, an improved shaft seal to which access may be had for repair or replacement, upon removal of the external motor, without disturbing or opening the compressor casing, and to reduce the number of bearings to a minimum, thereby reducing the cost of production and of operation, without impairing the efiiciency of the unit.

To the attainment of these ends and the accomplishment of other new and useful objects as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement of the several parts, hereinafter more fully described and claimed, and shown in the accompanying drawing illustrating this invention, in which The figure is a vertical sectional view of an apparatus of this character, constructed in accordance with the principles of this invention.

In the drawing, the numeral l designates, generally, a cylinder block in which is arranged any desired or suitable number of cylinders i i. The cylinders are provided with a cylinder head l2, secured in position in any suitable manner, such as by means of the usual fastening bolts I3, and a valve plate M having suitable valves l5 therein. The head I2 is provided with the usual inlet and discharge outlet openings, one of which, I6, is shown.

Reciprocable in each of the cylinders is a piston I1, connected by means of a piston rod l8, to an eccentric strap l9 which co-operates with an eccentric 20 mounted upon the main shaft 2| of the compressor. The shaft 2| is journaled in a suitable bearing 22 in one of the walls of the compressor chamber, and also has a bearing against a suitable ball bearing 23 mounted in a head 24, the latter being secured in position by means of fastening devices 25. The ballbearing 23 has engagement with a suitable bearing plate 26 and also a bearing member 21, the latter being seated in a recess 28 in the end of the shaft 2i, and the parts are held in engagement by means of a suitable spring 29. A counterweight 30 may be provided on the shaft 2|, to counterbalance the eccentric 20, and a projection 3| may also be provided on the eccentric strap N, to counterbalance the part and assist in lubricating the parts, as the shaft rotates, by the splash system.

All of the above described parts are of the usual and well-known construction. The shaft 2! projects for any suitable distance beyond the wall 32 of the casing, and is preferably reduced in diameter, as at 33, to form a shoulder 34, against which a member 35 of the shaft seal rests. Encompassing the shaft and resting against the member 35, is another member 36.

The packing type rotary shaft seal comprises a series of members 3l38 of suitable material, and also a washer member 39 constructed of any suitable pliable or resilient material. The seal assembly thus formed is disposed within a cupshaped casing or housing 40, through the bottom of which the shaft passes. The housing 40 is provided, preferably, with a flanged base H that abuts the outer face of the wall 32, a portion of the wall preferably extending into the housing, as at $2. This housing is removably secured in position in any suitable manner, such as by means of fastening bolts 43.

The motor for operating these parts is disposed outside of the compressor casing, and consists, essentially, of a stator member 44, which is held in position in any suitable manner, but preferably by means of a cap member 45, which is of annular construction to provide an opening 46. This cap member is secured to the wall 32 preferably by means of rods or bolts 41 which pass through a flange 48 on the cap member, and are threaded into the wall of the casing, as at 49, nus 50 being threaded u on the other end of the bolts. This stator member may be of the ordinary and well-known construction, and

the wall 32 of the casing may be provided with a recess ii, into which a portion of the stator member projects, thereby permitting the stator member to be placed in close proximity to the compressor casing.

Rotating within the stator member, is a rotor II, the hub 53 of which is provided with an open end recess This rotor is sleeved upon the shaft 2|, and is held in position, preferably, by means of a suitable key I5. When in position, the casing ll and enclosed sealing assembly project into the recess 54, and the bottom of the recess 54 preferably rests against a shoulder 58 on the shaft 2|. These parts are held in assembled re ation, preferably, by means of a nut or col ar 51 en a ing th eads 58 on the shaft.

The extremity of the shaft 2! passes through the opening 46 and bevond the cap member I5, and secured to such extremity is a fan I! of any suitab e construction, and of an desired size. Th s fan serves as a means for cooling the motor, and, by being mounted upon the main shaft of the compressor, it will be manifest that an extra motorfor drivin the fan ill be dis ensed with.

As the compre sor operates, the lubricant in the compressor casin will be delivered, by the splash svstem, intoa trou h or channel 60, from where it flows through suitable lubricating assages ii to lubricate the shaft and the rotating parts. A separate suitable screen or tubular housing 62 is provided. wh ch encom asses the motor and is held in position between the cap 45 and the wall 32 of the compressor, by means of the tie rods or bolts 41. I

With th s improved construction, it will be man ife t that outside oiling oi the bearings and fan will be el minated and. bv removal of the cap 5. access may be readily had to the motor. The rotor may then be removed, and access may be readily had to the shaft seal. The fan 59 is first removed. being secured to the shaft in any suitable manner, after which the rotor may be removed by removal of the nut or collar 51. Furthermore, the fan 59 also serves to cool the condenser 63, as well as the motor windings.

While the preferred form of the invent on has been herein shown and described, it is to be understood that various changes may be made in the details of construct on and in the combination and arran ement of the several parts. within the sco e of the claims. without departing from the spirit of this invention.

What is claimed as new is:

1. A compressor unit for refrigerating ap aratus comprising a housing; a compressor within the housing; a ma n operating shaft connected with the compressor and having one end extending through and beyond one wall of the housing, said one wall being formed to provide a supporting bearing through which the shaft extends; a packing type rotary seal assembly on the shaft outside the housing and closely adjacent thereto: a casing removably secured to th outside of the housing around the supporting bearing and including an outwardly projecting portion enclosing and supporting said seal assembly; an electric motor having a stator surrounding a rotor, said rotor including a hub secured on said shaft and having an open end recess receiving the sealing assembly; an annular cap member surrounding the shaft and covering the outer end of the motor stator; stator holding rod members detachably securing the cap member to said one wall of the housing and in spaced relat on thereto and to the motor stator; and a separate tubular housing member encompassing the motor and removably moimted between the annular cap member and thesaidonewallof the housing.

2. A compressor unit for refrigerating apparatus comprising a housing; a compressor within the housing; a main operating shaft connected with the compressor and having one end extending through and beyond one wall of the housing, said one wall being formed to provide a supporting bearing through which the shaft extends; a removable head comprising a part of an opposite wall of the housing, said removable head including a bearing disposed within the housing and receiving the other end of the shaft; a packing type rotary seal assembly on the shaft outside the housing and closely adjacent thereto; a onepiece casing removably secured to the outside of the housing around the supporting bearing and including an outwardl projecting cup-shaped portion enclosing and supporting said seal assembly; an electric motor having a stator surrounding a rotor, said rotor including a hub keyed to said shaft and having an open end recess receiving the sealing assembly; an annular cap member surrounding th shaft and covering the outer end of the motor stator; stator holding bolts detachably securing the cap member to said one wall of the housing and in spaced relation thereto and to the motor stator, said one wall having an outer annula recess disposed inwardly of the seal assembly and receiving the adjacent end portion of the stator with space therearound; a separate screen encompassing the motor and extending between the annular cap member and the said one wall of the housing; and a fan mounted on the end of the shaft 9. short distance outwardly of the annular cap member.

3. A compressor unit for refrigerating apparatus comprising a housing; a compressor within the housing; a niain operating shaft connected with the compressor and having one end extending through and beyond one wall of the housing, said one wall being formed to provide a supporting bearing through which the shaft extends; a removable head comprising a part of an opposite wall of the housing; a resiliently yieldable thrust bearing mounted on said head within the housing and receiving the other end oi. the shaft; a packing type rotary seal asembly on the shaft outside the housing and closely adjacent thereto; a one-piece casing removably secured to the outside of the housing around the supporting bearing and including an outwardly projecting cup-shaped portion enclosing and supporting said seal assembly; an electric motor having a stator surrounding a rotor, said rotor including a hub keyed to said shaft and having an open end recess receiving the sealing assembly; an annular cap member surrounding the shaft and covering the outer end of the motor stator; peripherally spaced stator holding bolts detachably securing the cap member to said one wall of the housing and in spaced relation thereto and to the motor stator, said one wall having an outer annular recess receiving the adjacent end portion of the stator with space therearound; a separate cylindrical screen encompassing the motor and bolts extending between the annular cap member and the one wall of the housing; and a fan mounted on the end of the shaft a short distance outwardly of the annular cap member.

HERMAN M. GOLDBERG. ARVID E. KARLBERG.

- (References on following pm) I Number The following references are of record ln the 1917-760 me of this fitent:

UNITED s'm'ms mum's Number Name Date 2,096,297

1,470,548 Spohrer Oct. 9, 1923 2,106,488 1,722,284 Fisher July 30, 1929 2,136,097

1,738,104 Hall Dec. 3, 1929 2,150,347

1,761,038 Greenwald June 3, 1930 10 2,264,847

5 REFERENCES cm 6 Name Dot: Geiger July 11, 1933 Terry Jan. 30, 1934 Marbury Nov. 5, 1935 Hirsche May 19, 1938 Goldner et a1 Oct. 19, 1937 McCune Jan. 25, 1938 Browne Nov. 3, 1938 Sorensen Mar. 14, 1939 Johnson Dec. .2, 1941 

